package com.ruoyi.mobile.utils;

import org.apache.commons.codec.digest.DigestUtils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;

public class MD5 {
    public static final String charset = "UTF-8";
    /**
     * 签名字符串
     * @param text 需要签名的字符串
     * @param key 密钥
     * @param input_charset 编码格式
     * @return 签名结果
     */
    public static String sign(String text, String key, String input_charset) {
        text = text + key;
        return DigestUtils.md5Hex(getContentBytes(text, input_charset));
    }

    /**
     * 签名字符串
     * @param text 需要签名的字符串
     * @param sign 签名结果
     * @param key 密钥
     * @param input_charset 编码格式
     * @return 签名结果
     */
    public static boolean verify(String text, String sign, String key, String input_charset) {
        text = text + key;
        String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
        if(mysign.equals(sign)) {
            return true;
        }
        else {
            return false;
        }
    }

    /**
     * @param content
     * @param charset
     * @return
     * @throws SignatureException
     * @throws UnsupportedEncodingException
     */
    private static byte[] getContentBytes(String content, String charset) {
        if (charset == null || "".equals(charset)) {
            return content.getBytes();
        }
        try {
            return content.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
        }
    }

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    /**
     *
     * Method description : 跟客户端加密方法一致
     *
     * Author：        lipf
     * Create Date：   2015年9月10日 下午9:05:12
     * History:  2015年9月10日 下午9:05:12   lipf   Created.
     *
     * @param plainText
     * @return
     *
     */
    public static String getMd5_16(String plainText) {
        StringBuffer buf = new StringBuffer();
        MessageDigest md;
        try {
            md = MessageDigest.getInstance("MD5");

            md.update(plainText.getBytes());
            byte b[] = md.digest();
            int i;
            buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return buf.toString().substring(8, 24);
    }

    /**
     * MD5加密
     *
     * @param inStr
     * @return
     */
    public static String MD5Str(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);

        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }

    public static String md5PassWord(String code) {
        return org.springframework.util.DigestUtils.md5DigestAsHex(code.getBytes());
    }

    /**
     * @param inStr
     * @description md5加密 加UTF-8编码
     * @author tianyoupeng
     * @create 2018-06-13 09:41:24
     */
    public static String MD5StrUTF8(String inStr) {
        try {
            byte[] btInput = inStr.getBytes(charset);
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            StringBuffer sb = new StringBuffer();
            for(int i = 0; i < md.length; i++) {
                int val = ((int) md[i]) & 0xff;
                if(val < 16){
                    sb.append("0");
                }
                sb.append(Integer.toHexString(val));
            }
            return sb.toString();
        } catch(Exception e) {
            return null;
        }
    }

    /**
     * @param key
     * @param parameters
     * @description 对map中的内容进行md5加密
     * @author wenqiangl
     * @create 2018-05-18 10:56:05
     */
    public static String createSign(String key, SortedMap<String, Object> parameters) {
        StringBuffer sb = new StringBuffer();
        Set es = parameters.entrySet();// 所有参与传参的参数按照ASCII排序（升序）
        Iterator it = es.iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            Object v = entry.getValue();
            if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
                sb.append(k + "=" + v + "&");
            }
        }
        sb.append("key=" + key);
        String sign = MD5Encode(sb.toString(), charset).toUpperCase();
        return sign;
    }

    // 50位0
    private final static String SALT = "00000000000000000000000000000000000000000000000000";
    /**
     * 加盐方式 md5
     * @param pswd 密码
     * @return 加密串
     */
    public static String MD5Salt(String pswd) {
        String inStr = pswd + SALT;
        return MD5Str(inStr);
    }

    private static final String hexDigits[] = { "0", "1", "2",
            "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}
